Contacts of the helix formed by residues 313 - 340 (chain A) in PDB entry 4KYI


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ALA 313 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312A  GLU*     1.3    77.3    -      -       -      +
    314A  GLY*     1.3    56.7    +      -       -      +
    315A  THR*     4.4     7.0    -      -       +      +
    316A  ALA*     3.7    17.1    -      -       +      +
    317A  PHE*     2.7    32.1    +      -       -      +
    375A  ASN*     4.3     0.2    -      -       -      -
    376A  THR*     3.6     8.5    -      -       -      -
    380A  THR*     6.1     4.0    -      -       +      -
    245C  LYS*     6.5     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 314 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313A  ALA*     1.3    72.9    -      -       -      +
    315A  THR*     1.3    61.6    +      -       -      +
    317A  PHE*     3.4     1.6    +      -       -      +
    318A  GLU*     3.2    33.6    +      -       -      +
    375A  ASN*     3.4    21.6    +      -       -      -
    376A  THR*     3.9     5.7    +      -       -      -
    377A  GLY*     4.4    12.6    +      -       -      +
    380A  THR*     5.7     2.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 315 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313A  ALA*     3.3     6.2    -      -       +      +
    314A  GLY*     1.3    75.1    -      -       -      +
    316A  ALA*     1.3    66.3    +      -       -      +
    318A  GLU*     4.1     8.0    -      -       -      +
    319A  ASP*     3.1    26.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 316 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312A  GLU*     3.9    14.8    -      -       +      +
    313A  ALA*     3.2    26.3    +      -       +      +
    315A  THR*     1.3    83.3    +      -       -      +
    317A  PHE*     1.3    62.6    +      -       -      +
    319A  ASP*     4.0     5.5    -      -       -      +
    320A  ARG*     3.5    18.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 317 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312A  GLU*     3.8    11.9    +      -       +      +
    313A  ALA      2.7    17.6    +      -       -      +
    314A  GLY      3.6     4.7    -      -       -      +
    316A  ALA*     1.3    76.7    -      -       -      +
    318A  GLU*     1.3    70.8    +      -       +      +
    320A  ARG*     3.2    21.3    +      -       -      +
    321A  VAL*     3.1    38.3    +      -       +      +
    373A  TYR*     3.7    31.4    -      -       +      -
    374A  ILE      4.1     4.5    -      -       -      -
    375A  ASN*     3.6    47.6    -      -       +      -
    397A  ASN*     4.3     6.3    -      -       -      -
    401A  GLN*     3.3    30.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 318 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314A  GLY      3.2    18.2    +      -       -      +
    315A  THR*     4.3     7.6    -      -       -      +
    317A  PHE*     1.3    89.1    -      -       +      +
    319A  ASP*     1.3    57.9    -      -       -      +
    321A  VAL*     3.8     4.7    -      -       -      -
    322A  ASN*     2.8    47.0    +      -       -      +
    375A  ASN*     4.9     7.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 319 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315A  THR      3.1    20.3    +      -       -      +
    316A  ALA*     4.0     7.6    -      -       -      +
    318A  GLU*     1.3    78.1    -      -       -      +
    320A  ARG*     1.3    60.5    +      -       -      +
    322A  ASN*     4.0     6.0    -      -       -      +
    323A  LYS*     3.1    48.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 320 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312A  GLU*     2.5    37.5    +      -       -      +
    316A  ALA      3.5     8.5    +      -       -      +
    317A  PHE*     3.2    23.9    +      -       -      +
    319A  ASP*     1.3    75.8    -      -       -      +
    321A  VAL*     1.3    87.1    +      -       -      +
    323A  LYS*     3.6     9.9    +      -       -      +
    324A  ALA*     3.3    21.6    +      -       +      +
    373A  TYR*     3.6    53.2    -      -       -      +
    401A  GLN*     4.3     6.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 321 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  PHE*     3.1    37.1    +      -       +      +
    318A  GLU*     3.3     6.3    +      -       -      +
    320A  ARG*     1.3    99.6    -      -       -      +
    322A  ASN*     1.3    61.9    +      -       -      +
    324A  ALA*     3.2     7.4    +      -       +      +
    325A  LYS*     2.9    57.3    +      -       +      +
    401A  GLN*     5.2     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 322 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    318A  GLU*     2.8    37.6    +      -       -      +
    319A  ASP*     4.0     6.5    -      -       -      +
    321A  VAL*     1.3    75.9    -      -       -      +
    323A  LYS*     1.3    58.6    +      -       +      +
    324A  ALA      3.0     4.7    -      -       -      -
    325A  LYS*     3.3    19.3    +      -       -      +
    326A  GLN*     2.9    33.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 323 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    319A  ASP*     3.1    40.8    +      -       -      +
    320A  ARG*     4.0     8.1    -      -       -      +
    321A  VAL      3.4     0.4    -      -       -      -
    322A  ASN*     1.3    75.3    -      -       +      +
    324A  ALA*     1.3    57.6    +      -       -      +
    326A  GLN*     4.0    18.8    -      -       -      +
    327A  SER*     3.6    19.9    +      -       -      -
    361A  ARG*     3.9    16.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 324 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320A  ARG*     3.3    12.6    +      -       +      +
    321A  VAL*     3.2    11.0    +      -       +      +
    322A  ASN      3.0     0.4    -      -       -      -
    323A  LYS*     1.3    78.3    -      -       -      +
    325A  LYS*     1.3    64.8    +      -       +      +
    326A  GLN      3.1     1.1    -      -       -      -
    327A  SER      3.6     1.4    +      -       -      +
    328A  ALA*     3.2    24.9    +      -       -      +
    361A  ARG*     4.2    19.7    -      -       -      +
    557A  LYS*     5.1     0.4    +      -       -      -
    604A  GOL      4.2     6.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 325 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321A  VAL*     2.9    42.8    +      -       +      +
    322A  ASN*     3.8    18.0    +      -       -      +
    324A  ALA*     1.3    76.9    -      -       +      +
    326A  GLN*     1.3    59.8    +      -       -      +
    329A  MET*     3.2    32.5    +      -       +      +
    557A  LYS*     4.0    25.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 326 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  ASN*     2.9    16.4    +      -       -      +
    323A  LYS*     4.1    21.9    -      -       -      +
    325A  LYS*     1.3    74.4    -      -       -      +
    327A  SER*     1.3    56.7    +      -       -      +
    328A  ALA      3.0     4.0    -      -       -      -
    329A  MET*     3.0    34.0    +      -       +      +
    330A  GLU*     3.0    35.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 327 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323A  LYS      3.6    14.9    +      -       -      -
    324A  ALA      3.6     4.5    +      -       -      -
    326A  GLN*     1.3    78.3    -      -       -      +
    328A  ALA*     1.3    57.4    +      -       -      +
    330A  GLU*     4.1    16.7    +      -       -      +
    331A  ALA*     3.7    17.0    +      -       -      +
    360A  ASN*     4.2    18.6    +      -       -      +
    361A  ARG*     3.6    37.5    +      -       -      +
    604A  GOL      4.3     8.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 328 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324A  ALA      3.2    17.0    +      -       -      +
    325A  LYS      4.0     0.2    -      -       -      +
    326A  GLN      3.0     0.8    -      -       -      -
    327A  SER*     1.3    77.8    -      -       -      +
    329A  MET*     1.3    64.1    +      -       -      +
    330A  GLU      3.4     0.4    -      -       -      -
    331A  ALA*     3.8     9.9    -      -       -      +
    332A  ILE*     3.5    21.3    -      -       -      +
    543A  GLU*     4.0    15.4    -      -       -      +
    557A  LYS*     3.7    28.2    -      -       -      +
    604A  GOL      3.8    19.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 329 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325A  LYS*     3.2    23.0    +      -       +      +
    326A  GLN*     3.0    21.2    +      -       +      +
    328A  ALA*     1.3    78.5    -      -       -      +
    330A  GLU*     1.3    60.6    +      -       +      +
    331A  ALA      3.2     0.2    -      -       -      -
    332A  ILE*     3.3    11.8    +      -       +      +
    333A  SER*     3.0    26.0    +      -       -      -
    557A  LYS*     4.3    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 330 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326A  GLN*     3.0    36.4    +      -       +      +
    327A  SER*     4.3    15.2    +      -       -      +
    328A  ALA      3.4     0.2    -      -       -      -
    329A  MET*     1.3    76.9    -      -       +      +
    331A  ALA*     1.3    57.3    +      -       -      +
    333A  SER*     3.8     9.2    -      -       -      -
    334A  TRP*     2.7    59.0    +      -       +      +
    359A  LEU*     6.1     1.2    -      -       -      +
    360A  ASN*     5.4     6.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 331 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    327A  SER      3.7    10.1    +      -       -      +
    328A  ALA*     3.8    11.9    -      -       -      +
    330A  GLU*     1.3    81.0    -      -       -      +
    332A  ILE*     1.3    58.6    +      -       +      +
    334A  TRP*     4.3     5.2    -      -       -      +
    335A  PHE*     3.7    17.0    +      -       -      +
    359A  LEU      5.7     4.0    -      -       -      -
    360A  ASN      6.3     0.2    -      -       -      +
    539A  TRP      4.5     2.3    -      -       -      +
    541A  PRO*     4.1    22.1    -      -       +      +
    542A  ILE*     5.5     0.9    -      -       +      +
    543A  GLU*     5.9     2.2    -      -       +      -
    604A  GOL      3.7    24.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 332 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    328A  ALA      3.5    17.9    -      -       -      +
    329A  MET*     3.3    10.1    +      -       +      +
    330A  GLU      3.2     0.4    -      -       -      -
    331A  ALA*     1.3    74.7    -      -       +      +
    333A  SER*     1.3    65.6    +      -       -      +
    335A  PHE*     3.3    10.3    +      -       +      +
    336A  LYS*     3.1    31.5    +      -       -      +
    541A  PRO*     4.7    18.8    -      -       +      -
    543A  GLU*     5.0     4.9    -      -       +      +
    553A  ALA      6.6     0.2    -      -       -      -
    554A  GLN*     5.9     0.9    -      -       -      -
    555A  ASP*     4.9     5.8    -      -       +      +
    556A  PHE*     3.4    61.7    -      -       +      +
    557A  LYS*     4.2     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 333 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  MET      3.0    16.0    +      -       -      -
    330A  GLU*     3.1    11.4    +      -       -      -
    332A  ILE*     1.3    78.4    -      -       -      +
    334A  TRP*     1.3    53.3    +      -       -      +
    336A  LYS*     3.3     9.9    +      -       -      +
    337A  ALA*     2.8    35.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330A  GLU*     2.7    51.0    +      -       +      +
    331A  ALA*     4.3     4.9    -      -       -      +
    333A  SER*     1.3    75.1    -      -       -      +
    335A  PHE*     1.3    59.5    +      -       -      +
    337A  ALA*     3.5    15.9    +      -       +      +
    338A  ARG*     3.2    19.9    +      -       -      +
    355A  THR*     4.1    35.4    -      -       +      -
    359A  LEU*     3.7    45.5    -      -       +      +
    539A  TRP*     3.9    40.6    -      +       +      +
    601A  EDO      4.9     9.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    331A  ALA      3.7     9.7    +      -       -      +
    332A  ILE*     3.3    13.1    +      -       +      +
    333A  SER      3.2     0.4    -      -       -      -
    334A  TRP*     1.3    75.5    -      -       -      +
    336A  LYS*     1.3    64.5    +      -       +      +
    337A  ALA      3.1     1.3    -      -       -      -
    338A  ARG*     2.9    20.0    +      -       -      +
    339A  MET*     3.0    53.2    +      -       +      +
    536A  ASN*     3.4    21.3    -      -       +      -
    539A  TRP*     3.2    31.1    +      -       +      +
    540A  ALA*     3.4    13.7    -      -       +      -
    541A  PRO*     3.8    11.4    -      -       +      -
    553A  ALA*     3.4    41.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 336 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332A  ILE*     3.1    18.2    +      -       -      +
    333A  SER*     3.7    10.6    -      -       -      +
    335A  PHE*     1.3    85.2    -      -       +      +
    337A  ALA*     1.3    57.1    +      -       -      +
    339A  MET*     4.4     6.1    -      -       +      +
    340A  ASP*     2.8    56.0    +      -       -      +
    556A  PHE*     4.0    27.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 337 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333A  SER*     2.8    20.0    +      -       -      +
    334A  TRP*     3.5    25.6    -      -       +      +
    335A  PHE      3.1     0.2    -      -       -      -
    336A  LYS*     1.3    78.7    -      -       -      +
    338A  ARG*     1.3    55.7    +      -       -      +
    340A  ASP*     4.1     4.3    -      -       -      +
    341A  SER*     3.2    23.3    +      -       -      -
    601A  EDO      3.7     8.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 338 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334A  TRP      3.2    11.3    +      -       -      +
    335A  PHE      2.9    10.5    +      -       -      +
    337A  ALA*     1.3    76.5    -      -       -      +
    339A  MET*     1.3    62.5    +      -       -      +
    341A  SER*     2.3    30.4    +      -       -      +
    342A  LEU*     3.5    22.9    +      -       -      +
    519A  GLU*     2.6    43.3    +      -       -      -
    532A  THR      3.3     6.9    +      -       -      -
    535A  LEU*     3.3    31.3    +      -       -      +
    536A  ASN*     2.4    44.9    +      -       -      +
    539A  TRP*     3.8    31.5    -      -       +      +
    601A  EDO      3.7    24.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 339 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335A  PHE*     3.0    53.1    +      -       +      +
    336A  LYS*     3.4     6.5    +      -       +      +
    338A  ARG*     1.3    79.0    -      -       -      +
    340A  ASP*     1.3    63.4    +      -       -      +
    341A  SER      3.2     0.2    -      -       -      -
    342A  LEU*     3.3    29.6    -      -       +      +
    343A  VAL*     4.8     3.3    -      -       -      +
    536A  ASN*     3.3    40.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 340 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336A  LYS*     2.8    43.5    +      -       -      +
    337A  ALA*     4.1     5.2    -      -       -      +
    339A  MET*     1.3    77.4    -      -       -      +
    341A  SER*     1.3    61.5    +      -       -      +
    342A  LEU      2.9    13.4    -      -       -      +
    343A  VAL*     4.4     7.2    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il